AssemblyAI

What is AssemblyAI?

AssemblyAI provides accurate speech-to-text plus higher-level audio intelligence, such as speaker diarization, summarization, and content moderation, all through a single API. It's aimed at developers building transcription, call analytics, or voice features into their own products rather than at end users.

Key features

• High-accuracy speech-to-text for pre-recorded and streaming audio
• Speaker diarization to label who said what
• Audio intelligence: summaries, topics, sentiment, and moderation
• Real-time streaming transcription over WebSocket
• Simple REST API with SDKs for major languages

How to get started

1. Sign up at assemblyai.com and grab an API key
2. Upload or point the API at an audio/video file or stream
3. Enable the intelligence features you need in the request
4. Poll or stream the results back into your app

Use cases

• Adding transcription to a meeting or podcast product
• Call-center analytics and QA
• Captioning and searchable video archives
• Voice features in an app without training your own model

AssemblyAI vs. alternatives

FAQ

Is AssemblyAI free to use?

AssemblyAI's plans: Usage-based API pricing, free tier to start. Pricing and free-tier limits change over time, so check the official site above for the latest details.

What is AssemblyAI used for?

Speech-to-text and audio-understanding models delivered as a developer API.

Who is AssemblyAI best for?

AssemblyAI is a good fit for adding transcription to a meeting or podcast product, or call-center analytics and QA.

What are the alternatives to AssemblyAI?

Commonly compared alternatives include OpenAI API and Deepgram, see the comparison above for how they differ.